[]Laya.timer.once 嵌套 的问题

Laya.timer.once(800, this, function () {

   Laya.SoundManager.playSound("sound/readygo.mp3", 1, Laya.Handler.create(this, this.playReadyComp));

 })

private playReadyComp (){

   Laya.timer.once(800, this, function () {

        Laya.SoundManager.playMusic('sound/bgm.mp3', 0);   

   })

}